Detroit Free Press Staff Writer

Friday’s upset by Mercer of Duke, combined with Thursday’s surprise wins by Dayton over Ohio State, Harvard over Cincinnati and North Dakota State over Oklahoma knocked out all 16 brackets in the NCAA men’s basketball tournament.

“Many more are still contending for the 20 first place prizes of $100,000 for the most accurate brackets,” Quicken Loans spokesman Aaron Emerson said in an e-mail. “Good luck to the 16 remaining bracketologists.”

Quicken Loans hasn’t released the number of people who registered their brackets in the contest.

Billionaire Warren Buffett’s investment firm Berkshire Hathaway is co-sponsoring the bracket competition based on the NCAA March Madness men’s college basketball tournament.